Guys, please, do I need the data in the MySqL table not to be added, but interchanged?

Question

PHP

From the Admin panel I enter data into the database, and then this data is displayed on the site itself, but when entering data into the admin panel, the data is simply added
. How can I make sure that they are replaced, and not a new line is added?

Answer 1

update table set btc=123 where id=1